Solid-State Memory Thermal Reconditioning for Write Endurance
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Solution Overview
Problem
NAND flash memory components in mass storage devices face limitations in write endurance due to wear and fatigue from programming and erasing processes, especially in high-access environments, where excessive cycles lead to electron trapping and reduced data retention, causing premature failure.
Innovation Solution
A mass storage device with a printed circuit board, solid-state memory components, and a heating mechanism that applies a preselected temperature above the intrinsic operating temperature to thermally recondition the memory components, increasing write endurance by facilitating self-healing of the tunnel oxide layer and floating gate, while inhibiting heat transfer losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If programming and erasing operations are performed frequently to maintain data in high-access environments, then data accessibility is improved, but write endurance deteriorates due to wear and fatigue of the tunnel oxide layer
Solution Approach 1:
The patent applies thermal treatment at elevated temperatures (e.g., 85°C to 125°C) to convert the harmful effects of programming and erasing operations into beneficial self-healing of the tunnel oxide layer. The heat activates processes that release trapped electrons and repair damaged atomic bond sites, thereby restoring write endurance after intensive write operations
Solution Approach 2:
The patent changes the temperature parameter of the memory device by applying thermal treatment at elevated temperatures above the intrinsic operating temperature. This parameter change enables the tunnel oxide layer to undergo thermal reconditioning, which releases trapped electrons and repairs damage, thereby improving write endurance without affecting data storage capability
2Reliability
If thermal treatment is applied to increase write endurance, then reliability is improved, but energy consumption increases due to heating requirements
Solution Approach 1:
The patent implements thermal treatment periodically rather than continuously, applying heat at predetermined intervals or after a predetermined number of program/erase cycles. This periodic approach allows the memory device to accumulate write operations that degrade the tunnel oxide layer, then apply thermal treatment to restore it, thereby improving write endurance while minimizing energy consumption compared to continuous heating
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The thermal treatment significantly increases the write endurance of solid-state memory components, extending their lifespan and reducing failure rates by periodically releasing trapped electrons and maintaining data integrity, particularly beneficial in high-traffic systems where data is constantly rewritten.
Implementation Method 1
heating the memory component to a preselected temperature that is above an intrinsic operating temperature of the memory component and sufficient to thermally recondition the memory component
Implementation Method 2
thermally recondition the memory component and thereby increase the write endurance of the memory component
Implementation Method 3
Over time the tunnel oxide layer releases trapped electrons. This process is referred to as detrapping of electrons
Implementation Method 4
inhibiting convection and radiation heat transfer losses from the memory component
Implementation Method 5
inhibiting convection and radiation heat transfer losses from the memory component
Data Source
AI summary
A mass storage device that utilizes one or more solid-state memory components to store data for a host system, and a method for increasing the write endurance of the memory components. The memory components are periodically heated above an intrinsic operating temperature thereof to a preselected temperature that is sufficient to thermally recondition the memory component in a manner that increases the write endurance of the memory component.